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2011 May 02
32
[PATCH] blkback: Fix block I/O latency issue
...bsystem. The new I/O is dispatched as soon as one of the previous I/Os completes. As a result of this issue, the block I/O latency performance is degraded for some workloads on Xen guests using blkfront-blkback stack. The following change addresses this issue: Signed-off-by: Pradeep Vincent <pradeepv@amazon.com> diff --git a/drivers/xen/blkback/blkback.c b/drivers/xen/blkback/blkback.c --- a/drivers/xen/blkback/blkback.c +++ b/drivers/xen/blkback/blkback.c @@ -383,6 +383,12 @@ static int do_block_io_op(blkif_t *blkif) cond_resched(); } + /* If blkback might go to sleep (i.e. more_to_do...